Question

Which situation would result in a theory being replaced rather than revised?

Answer 1

If new information is discovered that contradicts the theory then the theory would be replaced.

We cannot use a theory that has contradictions since it would yoild questionable results.

However if we discover additional information supporting the theory then we would just revise it.

This would just mean improving the theory.

Answer 2

The question is incomplete.

However,

Scientific theory: An explanation accompanied with the testing and verification of the natural world by scientific methods is called as a scientific theory.

The situation where new information is discovered that contradicts the existing theory.  

Reason:  

• The replacement of the old theory.
• A contradicted theory cannot be used.
• Improvement of the existing theory.

Hence, the answer is new information is discovered that contradicts the existing theory.